AccuFlux

AccuFlux™ Viscosity Independent Flow Control for Reservoirs with Larger, Uniform Particle Size Distributions.

AccuFlux combines the advantages of nozzle based downhole flow control with AccuRite™ wire wrap screen, a gap based sand control that requires sand sampling and analysis for accurate gap sizing. The flow control capability can be configured to the formation requirements at the wellsite prior to deployment.

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AccuFlux has strategically positioned nozzles at the end of each sand control sub, which allow pressure profile control for optimizing toe-to-heel flow control in unconsolidated formations with larger, uniform particle sizes distributions.

Flow control also aids in removing formation damage from drilling and completion fluids or operations. AccuFlux sand control is comprised of keystone shaped wire continuously wrapped and spot welded over perforated base pipe. The uniform gap size between each wire should be sized to the specific reservoir characteristics.

The Challenge

Well completion decisions must balance efficient sand control with optimum well productivity and cost concerns. Operators are recognizing that the intervals along laterals do not contribute production equally. They need effective ways to better manage the pressure profile from toe to heel in order to clean up drilling fluids and later to delay water influx. As well, sand entering the wellbore over time can reduce well productivity, damage surface facilities, or worse, cause expensive remediation and catastrophic well failure.

AccuFlux
AccuFlux

The Solution

AccuFlux is a cost effective sand and flow control option suitable for more consolidated and homogeneous reservoirs with relatively uniform particle size distributions.

  • With proper gap sizing based on reliable and representative solids sampling and accurate particle size analysis, AccuRite screen sections can be manufactured with 7-12% open flow area.
  • Nozzle based flow control is viscosity independent which allows the delay of water influx. The flow control capability integrated into AccuFlux can also be tailored to reservoir potential at each interval by selecting from different nozzle styles and sizes.

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AccuFlux Applications

AccuFlux is best suited for relatively consolidated, uniform sands with larger particle sizes.

  • Horizontal producer or injector wells requiring pressure profile control and sand control may not be required along the entire wellbore
  • Vertical wells with commingled zones of different pressures
  • Thermal wells that require uniform toe-to-heel steam injection
  • In combination with external/swell packers to isolate zones and minimize annular flow
  • As a limited entry perforation screen

Viscosity Independent Flow Control

Unlike channel or tube-based ICDs, nozzles are relatively viscosity independent as shown below. The pressure drop is measured for various fluids passing through a standard 4.00 mm nozzle.

Well Productivity

AccuFlux provides an effective inflow area that is 5 times greater than slotted pipe of the same gap size. Properly sized, AccuFlux screen stops sand from entering the wellbore. Fluid flows through the wire gaps, along the support grid to the nozzles which are viscosity independent flow control devices. A large flow area between the screen media and the base pipe prevents erosion and any undesirable pressure losses.

Wire wrap screen performance depends on larger grain sizes, representative sand samples, and accurate particle size distribution analysis for accurate gap sizing. With relatively large, uniform sands and proper gap sizing, stable arches (A) shown in the diagram below and bridges (B) will form across the gaps between wires and allow fluids to flow between the particles while stopping solids.

Injection Control

AccuFlux can be configured for either production or for steam or chemical injection at the wellsite prior to deploying the screen system. For injection, the port plugs are removed, threaded nozzles installed and plugs are reinstalled. Fluids are pumped into the wellbore and exit through nozzles that are strategically placed so thief zones are shut off and injected fluids have their intended impact. The AccuFlux flow path directs the fluid into the near wellbore area at the sand-screen interface for uniform injection of gas, water, or steam from toe-to-heel of the well.

AccuFlux Options Available

Depending on the application, the screen sections are built using 90L, 90, 90H, 47 or 47H wrap and rib wire. Typical AccuFlux assemblies:

  • 32 feet of screen jacket on 38 feet of base pipe
  • 24 feet of screen jacket on 30 feet of base pipe
  • Customized lengths can be provided

Unique applications are addressed with erosion- corrosion resistant metallurgies options for length and diameter of base pipe.

Many factors influence proper completion design. Absolute’s Technical Application Managers located around the world are available to assist completion teams with configuring sand control and flow control solutions to achieve optimal well performance through:

  • Guidance on reservoir characterization and profiling
  • Down hole flow control design and configuration options
  • Screen options that balance long term well productivity and effective sand control with cost considerations
  • Recommendations on the advantages of using passive flow control technologies to extend well life